Creamy Cole Slaw

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1 head green cabbage, finely shredded

2 large carrots, finely shredded

3/4 cup best-quality mayonnaise

2 tablespoons sour cream

2 tablespoons grated Spanish onion

2 tablespoons sugar, or to taste

2 tablespoons white vinegar

1 tablespoon dry mustard

2 teaspoons celery salt

Salt and freshly ground pepper